I have a Python component script that generates a specification for beams (how many beams of a given length). At first, I took lengths from the guide curves along which I lofted the profile, but later I needed to trim the resulting Brep. Is there a way to get the lengths of a Brep, and if so, how? …

[beam_length_2025May23a] beam_length_2025May23a.gh (404.9 KB) P.S. Added white group to display cut beam lengths at the middle of each beam. [beam_length_2025May23b] beam_length_2025May23b.gh (409.0 KB)

Looks like the columns line up nicely with the worldxy plane, so I think you can use the boundingbox component and then feed that into the deconstruct bounding box component, and then feed the Z value (the start Z to the end Z). Since the columns are one the floor plane, the height would just be the…

You can get the same result by deconstructing the diagonal vector: [bbox example_2025May23a] bbox example_2025May23a.gh (13.1 KB)

All my columns are indeed parallel to the floor, but I also need to calculate the lengths of the beams, some of which are positioned diagonally. One more important clarification: my beams aren’t square; they’re assigned a specific cross-section (I-beam, channel, or angle). Am I correct in understan…

[image] Julia: Am I correct in understanding that for such an arrangement, neither your solution nor @Joseph_Oster will work? NO :bangbang: Definitely not. Your “understanding” is incorrect. If you had posted a file we could have helped you. [image] Help Us Help Yo…

The diagonal of the bounding box will be a close approximation (as long as the beams are much longer than their profile size). Another way would be to get the length of the longest edge (DeconstructBrep → CurveLength → Sort → ListItem).

[image] Measure: The diagonal of the bounding box will be a close approximation (as long as the beams are much longer than their profile size). The Z component of the diagonal will work even for short beams, eh? [image] Measure: Another way would be to get the length of the longest edge. …

My understanding is that the OP needs the physical 3D length of the beam rather than a specific component.

I must be missing your point? The Z component of a bounding box diagonal will be the height.

I agree that you can measure the height that way. I just don’t think the height is the value the OP is trying to measure.

I reduced the number of beams and columns (the number of columns depends on the number of beam intersections) so that the file wouldn’t hang. I’m also attaching a picture showing exactly what I want to measure. script.gh (53.0 KB) [photo_2025-05-23_15-43-23]

Is it possible to calculate the length of a Brep using Grasshopper?

Grasshopper

Joseph_Oster May 23, 2025, 12:17pm 5

NO Definitely not. Your “understanding” is incorrect.
If you had posted a file we could have helped you.

3. Attach minimal versions of all the relevant files

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Is it possible to calculate the length of a Brep using Grasshopper?

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